Packing



Dec. 20, 1932. CHEsHlRE 1,891,798

PACKING Filed July 30, 1929 Iwvmwonc Hownno .B CHBHIRE.

A TTOBNE Y properly spaced.

Patented Dec. 20, 1932 UNETED STATES 7 HOWARD B. CHESHIRE, F LONG BEACH,CALIFORNIA.

PACKING Application filed July 30,

This invention relates to a metallic packing which is adapted to be usedupon any reciprocating rod or shaft, or any journal packing.

An object of my invention is to provide a plurality of arcuate segmentsover-lapping one upon the other so that a shaft is efiectively packedirrespective of the irregularities of the shaft.

Another object is to provide a packingin which there is less pressure ofthe segment on thevshaft.

Still another object is to provide a packing which is elfectiveirrespective of the speed of the shaft therethrough.

Other objects, advantages and features of invention may appear. from theaccompanying drawing, the detailed subjoined descrip tion and theappended claim. 7

In the drawing:

Figure 1 is a transverse sectional view of my packing in position on ashaft.

Figure 2 is an end view of the packing with the cover plate and spacingring removed.

Figure 3 is a fragmentary side view of one of the spacing rings.

Referring more particularly to the drawing, my packing 1 is adapted tobe placed about a shaft 2 to prevent the leakage of any fluid aroundsaid shaft. My packing comprises a pair of end plates 3+4, said endplates being spaced apart for an annular ring 5 which is grooved orrecessed to receive the end plates as shown in Figure l. A plurality ofpacking segments 6 are arranged about the shaft 2 substantially as shownin Figure 2, and these segments are slightly spaced apart and aresuperimposed upon a second ring of identical segments, the segmentsover-lapping upon the segments of the adjacent ring. Each ring ofsegments is pressed inwardly against the shaft by aspring 7. Each of thesegments are grooved as at 8 to receive the spring '7. In order that thesegment 6 may be held 111 proper spacing relation, I provide spacingrings 910,1and these rings are provided with spacing lugs 11 which fitbetween the segment 6 to hold them The spaced rings 9-10 bear againstthe 1929. Serial No. 382,123.

end plates 84 respectively, and fit accurate 1y inside of the annularring 5. To hold the entire assembly tightly together and also to preventleakage between the segments or the other members of the packing, Iprovide a plurality of coil springs 12 which extend be-;

tween theplate at and the flange of the stuif mg box 13. The plate 3 ofthe packing rests against the collar 14 which forms part of the enginecasting. With the arrangement just described, I have determined inactual 7 practice that there is less pressure of the segments againstthe shaft than in packing heretofore in use, for the reason that thesurface area of the segments is the same against.

the shaft and also on the surface opposite, to the shaft. This meansthat the steam pressure or fluid pressure is equalized on both sides ofthe segments.

lVith the'arrangement of a plurality of segments as shown,irregularities in the shaft are more easily taken care of, and also theshaft is more effectively packed ofi'. With my arrangement it is notnecessary to provide grooves in which the segments fit, these grooveswhen used, result in excessive wear on the segments. Mypacking maybe'readily assembled or disassembled, in that the end plates 3-4, andthe ring 5 fit one'in the otherwith a tongue and groove connection andare readily removed, in order to repair or replace the segments, springs7 orthe like. Also additional groups of segments maybe added by merelywidening the annular ring 5 to accommodate the additional segments.WVith my arrangement of a plurality of super-imposed segments, saidsegments being forced inwardly by the spring 7,1 automaticallycompensate for any wear in the segments by 1 reason of the fact that theinward pressure of the springs will urge the segments against the shaftwith a practically uniform pressure until the segments have become soworn that there is no further tension in the spring 7 Having describedmy invention, I claim:

A metallic packing adapted to be placed around a shaft or the like,comprising a plurality of circumferentially spaced segments bearingagainst the shaft, a second group of superimposed segments upon thefirst named segments, said second group of segments being so arranged asto bear upon and cover the spaces between the first named segments, acoil spring surrounding each of said groups of segments whereby thesegments are urged inwardly, end plates, an annular ring between the endplates, a. pair of spacing plates adjacent said segments, said platesbeing formed in one integral piece, spacing lugs projecting inwardlyfrom the spacing plates between the segments whereby the segments arespaced about the shaft and from each other, the side edges of each ofsaid segments being parallel to each other and said parallel edgesfitting closely against the spacing lugs whereby a tight metallicpacking is, provided.

In testimony whereof, I aflix my signature.

HOWARD B, CHESHIRE.

